Caustic cracking - Caustic cracking

Japanese: 苛性割れ - かせいわれ
Caustic cracking - Caustic cracking

...In Japan, research progressed after a crack was discovered in a spherical tank for storing LPG (liquefied propane gas) in 1962, and there were cases where the removal of trace amounts of hydrogen sulfide from LPG proved to be an effective preventive measure.
[Caustic cracking]
Intergranular cracking that occurs in high-temperature, high-concentration caustic soda solutions is called caustic cracking. In the past, the term caustic embrittlement was used, but the mechanism is said to be active path cracking, not hydrogen embrittlement. …

*Some of the terminology that refers to "caustic cracking" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…日本では,1962年にLPG(液化プロパンガス)貯蔵用球形タンクに割れが発見されたのを契機として研究が進み,LPGの中の微量硫化水素の除去が有効な防止策となった例がある。
[苛性割れ]
 高温高濃度の苛性ソーダ溶液中でおこる粒界割れを苛性割れという。古くは苛性脆化という言葉が使われたが,メカニズムとしては活性経路割れであり,水素脆化ではないとされている。…

※「苛性割れ」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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